Gang saw or other saw guide



Jan. 11, 1927. 1,614,188

D. F. DENHAM GANG s w OR OTHER sAw GUIDE Filed Jan. 8. 1925 I I jJ'Dm/wm.

gnowntoz Patented Jan. 11, 19.27.

Ul tll' RE STAT ES DAN rose DE HAM. 0F LAUREL l ilsfisfi lfl:

GANG SAW OR OTHER SAW GUIDE.

Application filed January This invention relates to improvements in gang and other saw machines, and more particularly to a device for maintaining timbers in true alignment with the saws.

The objects of the present invention are to provide a device of. animprovedand simplified structure by means of which timbers will be continuously engaged and held in true alignment.

The invention consists in the arrangement, combinations and association of parts hereinafter more particularly described and claimed.

One sheet of drawing accompanies this specification as part thereof in which like reference characters indicate like parts.

Figure 1 is a diagrammatic plan illustrating the improved device in association with the gang or other saw machines.

Figure 2 is a diagrammatical side elevation corresponding to Figure 1.

Figure 3 is-a cross-section view through a channel member 3 and cha n 23.

The machine shown in the drawing comprises two pair of timber supporting rollers l1 and 17-.17, arranged at opposite ends thereof, and a pair of timber feed rollers 15:15 centrally arranged in the machine on opposite s des of a gang of saws 16 (only two of which are shown in the drawing). The feed rollers 15-15, of course, are driven by any suitable gearing (not shown).

In order to guide the timber reetilinearly to and through the saws, there is provided between the advance pair of rollers 1-1, a framework supported independently of the supporting and feed rollers and comprising a pair of horizontal transverse supporting members 2, on which are fixed the channelled chain guiding skids 3. Uprights 1 supporting said supports 2 are limited to vertical reciprocation by the guide members 5 and are connected at their bottom ends by braces 6 and suitable cross members (not shown). The construction ofthe skid supporting framework involves nothing more than me. chanical skill, and its structural details are therefore, not illustrated nor described.

The skids supporting framework is supported for vertical adjustment by means of a chain 7 connecting the braces 6 to one end of a lever; 8 fulcrumed about a pivot 9 and having a counter-balancing and pressure controlling weight spring seated on and adjustably connected to the other end of lever 8 by set screws 10. In order to control the Serial No. 1.277.

distance through which the top of skids 3 extend above the tops of the supporting rollers 1, a flexible cable 11 is connected to the end of one arm of a bellcrank lever 12 pivoted at 12 and having the end of its other arm shaped to form an operating lever handle 13. A pawl 14 pivoted on said other arm is arranged for engagement wi h any of the notches of suitably supported rack 14'. It will be obvious from the drawing that movementof the lever 13 to the right of the position shown in Fig. 2, lowers the weight 10, and raises the whole guide skid support ng framework accordingly, and that the vertical position of the skids depend upon the adjustment of this handle relative to the rack 14.

Between the supporting discharge rollers 1717, a transverse shaft 18 has its ends fixed in one end of each of two levers 20, each pivoted intermediate its ends on fulcrum pivot 21 and having a counterweight mounted on each lever 20 to regulate the pressure of hubs of thediscs 19 against the supported plane surface of the timber. As

is customary in this art, the disks 19 are rotatable on and slidable along shaft 18 and are adapted to be held in desired adjusted positions on shaft 18 by the usual set collars 19. A flexible cable similar to cable 11 may be used to limit the upwarc swing of shaft 18 about the fulcrums 21.

The timber guiding is effected by endless chains 28 of any ordinary construction, each mounted to extend around a skid 3 and to slide on the web 24 of said skid which is provided with downwardly extending stiffening flanges 24; upwardly extending flanges 26 have their edges inturnedto engage the sides 27 of the chain links 23 to serve as means for rectilinearly guiding the saw chain along the skid, and each link is provided with projecting prongs 28 adapted to engage the roller supported face of a timber. The inturned ends of the skids serve tolimit the depth of insertion of the prongs on the timber to prevent unnecessary mutilation thereof.

In operation the guide skids 3 and chains carried thereby are lowered below the hearing surfaces of the supporting and feed rollers, by manipulating the handle 13, the timber to be resawn is positioned with its plane face on the advance feed roller 15, and the advance supporting rollers 1 in proper alinement with the saws. The handle 13 7 and abrupt vertical movements of the cant caused by vertical reciprocation of the reciprocating gang saws. 'lhro-ughout the whole vertical range of movement of the skids the pressure thereof and of the chains carried thereby is uniform.

The guide chains 23 do not feed the cunt to the saws; they merely engage the cant and the sides of the skids engage the sides of the chain and cause its prongs to engage the lower face of the cant to guide the latter in straight alinement with the saws. in other words, the cunt moves the chain 22 and the skids prevent undesirable sinking of the prongs into the timbers and serve to guide the timber by guiding the chains.

What I claim is:

1. In a gang or other saw machines, the combination with a guideway, aligned with and in advance of a saw, an endless chain slidable in said guideway and having outwardly directed prongs adapted to engage a. timber, said guideway having opposite inv-:ardly disposed flanges adapted to engage the sides of said chains to guide it.

2. In a gang or other saw machine, a channeled vertically reciprocable guideway skid aligned with and in advance of a saw, and having the channeled edges adapted to contact with the timber, an endless chain slidable in said channel and engaged by the sides of said channel to be guided thereby, and means for forcing said skid into contact with the timber at a constant predetermined pr me throughout all vertical reciprocntien thereof caused by the vertical pull of the saw on said timber while in contact therewith.

3. In a resawing machine, a gang of verticall y reciprocating saws, feed and supporting rollers on advance and discharge sides thereof, a guide skid having timber engaging flanges interposed between two of said rollers, and aligned with said saws, inelastie means independent of the feed and supporting rollers for supporting said guide skid with the edges of said flanges above the timber supporting part of said rollers, 21. chain slidably supported by said skid and having its sides in guided contact with said flanges, prongs projecting laterally from said chains to engage the roller supported face of said timber, said chain being movable in either direction on said skid solely by its engagement with said timber.

t. The combination with the machine set forth in claim 9, of inelastic means for yieldingly supporting said skid and chain to maintain said skid and chain in engagement with the roller supported face of said t' uber at a constant predetermined p" are.

5. The combination with the machine set forth in claim 9, of inelastic means for yieldingly supporting said skid to maintain said skid and chain in engagement with the roller supported face of said timber at a constant predetermined pressure, said inelastic means including means for varying and predetern'iining said constant pressure.

6. In a gang resawing machine, means for supporting and feeding a timber to the saws of said machine, a guide skid in advance of said saws and of said means to contact with. the supported surface of said timber, guide means independent of said feeding means and guided slidably lengthwise of and by said skid and projecting therefrom to engage and guide said timber to said saws, and means for maintaining said skid and guiding means in engagement with said timber at a constant predetermined pressure throughout all vertical reciprocation of the timber.

7. T he combination with the supporting and feeding mechanism of a resawing machine, of a channeled guide skid in advance o t and aligned with a saw, and a chain slidable lei'igthwise in the channel of said skid and guided. thereby, said chain having prongs projecting outwardly to engage the timber fed by said mechanism to said saw, and movable lengthwise of said guide skid only by its engagement with said timber, and inelastic means for yieidingly maintaining said skid and chain at constant pre determined pressure *ith the supported face of said timber.

In testimony whereof I atlix my signature.

DAN FORE DENHAM. 

